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Use a union to cast int to fp
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5849 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -73,15 +73,17 @@ static uint64_t HexIntToVal(const char *Buffer) {
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// point representation of it.
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//
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static double HexToFP(const char *Buffer) {
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uint64_t Result = HexIntToVal(Buffer);
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assert(sizeof(double) == sizeof(Result) &&
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"Data sizes incompatible on this target!");
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// Behave nicely in the face of C TBAA rules... see:
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// http://www.nullstone.com/htmls/category/aliastyp.htm
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//
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char *ProxyPointer = (char*)&Result;
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return *(double*)ProxyPointer; // Cast Hex constant to double
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union {
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uint64_t UI;
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double FP;
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} UIntToFP;
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UIntToFP.UI = HexIntToVal(Buffer);
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assert(sizeof(double) == sizeof(uint64_t) &&
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"Data sizes incompatible on this target!");
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return UIntToFP.FP; // Cast Hex constant to double
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}
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